EP1541852A1 - Injecteur de carburant pour un moteur à combustion interne - Google Patents

Injecteur de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP1541852A1
EP1541852A1 EP04027243A EP04027243A EP1541852A1 EP 1541852 A1 EP1541852 A1 EP 1541852A1 EP 04027243 A EP04027243 A EP 04027243A EP 04027243 A EP04027243 A EP 04027243A EP 1541852 A1 EP1541852 A1 EP 1541852A1
Authority
EP
European Patent Office
Prior art keywords
shutter
injector device
solenoid
fuel
gauged
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04027243A
Other languages
German (de)
English (en)
Other versions
EP1541852B1 (fr
Inventor
Mario Ricco
Sisto Luigi De Matthaeis
Claudio Amorese
Dario Manodoro
Raffaele Ricco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Publication of EP1541852A1 publication Critical patent/EP1541852A1/fr
Application granted granted Critical
Publication of EP1541852B1 publication Critical patent/EP1541852B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/0272—Ball valves; Plate valves; Valves having deformable or flexible parts, e.g. membranes; Rotatable valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0251—Details of actuators therefor
    • F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/14—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period
    • F02M69/145—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period the valves being actuated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the present invention related to fuel injector devices for internal combustion engines using an alternative fuel with respect to petrol or diesel oil, such as for instance methane, LPG, hydrogen or other fuels, either in gaseous or liquid state.
  • petrol or diesel oil such as for instance methane, LPG, hydrogen or other fuels, either in gaseous or liquid state.
  • injector devices are currently obtained from petrol injector devices. This is because engines using alternative fuels are not so widespread yet as to justify huge investments that would be required to back up designing activities dedicated to a new type of injector device. As a consequence, injector devices used until today in methane or LPG engines are the result of a compromise and therefore do not meet in an optimal way the specific requirements related to the injection of said alternative fuels. Namely, a main requirement is to adjust the injector device to working pressures related to the use of such fuels, which are far higher than the pressure at which petrol and diesel oil injectors work.
  • a common petrol injector device injects petrol at a pressure of about 3-4 bars, whereas working pressures of LPG and methane are certainly above 10 bars.
  • an injector device for a fuel such as LPG or methane does not have to meet other requirements that are specific for petrol injection, such as the one related to the particular shape of the injected spray (spray pattern) and to its granulometry.
  • LPG or methane injection adulterations of petrol injector devices aiming at obtaining shape and granulometry are useless, being it sufficient to meter the correct amount of fuel during injection.
  • the present invention therefore aims at carrying out a fuel injector device whose characteristics are such as to make it optimal specifically for the injection of alternative fuels such as LPG or methane, which is at the same time simple and cheap.
  • an injector device comprising:
  • the injector device there is a separation of fuel metering function, performed through said metering means with gauged hole, from sealing function, performed by the shutter in its closing condition.
  • the main advantage of this feature is that it enables to exploit a further important contrivance, which is also an object of the invention, i.e. said metering means with gauged hole are placed upstream, referring to the fuel flow inside the device, from the aforesaid shutter and its valve seat. Thanks to this contrivance, in the device according to the invention the solenoid control of the shutter is arranged downstream from the aforesaid metering means, i.e. on the low pressure side, thus ensuring an efficient sealing action of the shutter in spite of relatively high fuel supply pressures with respect to petrol injection.
  • the injector device according to the invention can also be used with quite high injection pressures, for instance of about 30 bars, which advantageously enables short injection times, short response times in engine transistors, an efficient adjustment and an optimization of strategies for controlling and reducing polluting emissions.
  • the injector device according to the invention is also characterized by an intrinsic safety function, since in case of faulty working it is kept in closing position by supply pressure and can therefore ensure sealing also up to pressures of 200 bars.
  • the simpler structure of the device according to the invention with respect to a "petrol"-derived injector device also enables to reduce its size, particularly in axis direction.
  • solenoid arrangement on the low pressure side ensures sealing towards outside of the solenoid in a simple and reliable way.
  • the solenoid is equipped with a mobile ferromagnetic element for controlling the shutter, which element includes an anchor facing an end of the solenoid, which is attracted by said end when the solenoid is actuated.
  • said anchor is equipped with a pin arranged through the solenoid and pushing the shutter towards its opening position when the solenoid is actuated.
  • the anchor is connected directly to the shutter body and "pulls" it towards its opening position when the solenoid is actuated.
  • the metering means with gauged hole are typically made up of a disk or a bushing, with a gauged hole for metering fuel, which is fastened inside the valve body.
  • Said mounting can be carried out in any known manner, but for sake of simplicity it can be carried out for instance by using a spring that holds the disk or bushing inside a seat obtained in the valve body.
  • number 1 globally refers to a fuel injector device for an internal combustion engine, carried out according to the present invention in order to meet the specific requirements concerning the specific injection of a fuel such as for instance LPG or methane in an optimal manner.
  • the device 1 includes a valve body 1, which in the example shown in the figure comprises a cylindrical element 3 mounted with the interposition of a sealing gasket 5 inside a cup-shaped element 4 and placed axially between said cup-shaped element and the bottom wall 6 of a housing support 7.
  • the device comprises an inlet connection 8 getting out through an opening of the wall 6, and an outlet connection 9 defined by the aforesaid cup-shaped element 4, having a channel 9a.
  • the inlet 8 and the outlet 9 of the device communicate one with the other through a passage including the axial channel 10 inside the connection 8, an axial hole 11 obtained inside the element 3, and the outlet duct defined by the connection 9.
  • the communication between inlet 8 and outlet 9 is controlled by a shutter 12 shaped as a disk with peripheral notches 12a for fluid passage ( Figure 2).
  • the shutter 12 cooperates with the valve seat comprising a ring-shaped abutting surface defined in the wall of the hole 11 of the element 3. It is pushed against said seat by a coil spring 13 placed between the shutter 12 and a disk 14 fastened inside a corresponding seat obtained in the inner hole 11 of the element 3.
  • the disk 14 has a central gauged hole 15 acting as fuel meter during injection.
  • said disk is held against its seat by a further ring-shaped disk 15, which is again pressed by an inner rounded end of the tubular element making up the connection 8.
  • Said element is blocked in position by a threaded bushing 16 screwed into a corresponding threaded hole of the element 3.
  • Number 17 refers to a solenoid for controlling the shutter 12.
  • Said solenoid is housed inside a ring-shaped seat obtained in the lower end (with reference to the drawing) of the element 3 and cooperates with a ferromagnetic mobile element made up of an anchor 18, basically disk-shaped with a slightly smaller outer diameter than the inner diameter of the cup-shaped element 4 and facing the lower end of the solenoid 17.
  • the anchor 18 is pushed by a spring 19 towards a lower rest position, and it is attracted against the element 3, against the action of the spring 19, when the solenoid 17 is actuated.
  • the anchor 18 is associated to a bar 20 arranged through the inner hole 11 of the element 3 and pushing with its upper end the shutter 12 towards an opening position against the action of the spring 13, when the solenoid 17 is actuated.
  • the fuel metering function is performed by the disk 14 with the gauged hole 15, which is a separate element with respect to the shutter 12, the latter performing conversely the sealing function when the valve is closed.
  • the solenoid 17 and the anchor 18 are placed downstream from the gauged hole 15, with reference to fuel flow direction, i.e. on the low pressure side (for instance around 1 bar), which enables to obtain the advantages mentioned above referring to the reduction of the strength required for controlling the shutter 12.
  • the sealing function of the shutter can thus be ensured despite far higher working pressures than in the case of petrol injection.
  • the aforesaid peculiar characteristics of the invention also affect a reduction of the overall size of the device, especially in axial direction.
  • the device has an intrinsic safety feature, since in case of faulty working sealing is ensured up to very high pressures of about 200 bars.
  • high injection pressures for instance in the range of 10 to 30 bars, enables to reduce injection times and therefore to reduce also response times of engine transistors with a more efficient adjustment and an optimization of strategies for controlling and reducing polluting emissions.
  • Figure 3 refers to a construction variant of the injector device shown in Figure 1.
  • the same parts as those shown in Figure 1 are referred to with the same number.
  • the main difference consists in that the device of Figure 3 is equipped with a sphere shutter cooperating with a conical valve seat 12b.
  • the embodiment of Figure 3 resembles on a functional level the one of Figure 1, except for the different shape of the various elements constituting it.
  • Figure 4 shows a further embodiment in which the axis of the solenoid 17, instead of coinciding with the common axis of inlet and outlet connections 8, 9, as in the case of Figures 1, 3, is orthogonal to the latter.
  • the connections 8, 9 are defined by elements mounted on opposite faces of the element 3, whereas the solenoid 17 with its ends 17a is placed inside a body 33 housed in a cylindrical seat defined by the element 3 and blocked in position by means of a further element 31 mounted onto the element 3.
  • a closing element 30 for the inner cavity 11 is fastened, for instance screwed, onto the end of the element 3 opposite the one with the element 31.
  • Said cavity is in direct communication with the channel 10 of the inlet connection 8 and faces a bushing 14 with the gauged metering hole 15, which bushing is held in position by a spring 34 placed between the bushing 14 and the closing element 30.
  • the gauged hole 15 ends above into a broadened cavity of the bushing 14, which acts as seat for the shutter 12, basically spherical and connected directly to the anchor 18.
  • the latter is controlled by the solenoid 17, which is mounted, as was already mentioned, inside the element 3 in such a position that the solenoid axis is orthogonal to the axis of the channel 10 of the inlet connection 8, and - as shall be seen - to the axis of the channel of the outlet connection 9.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP04027243A 2003-12-10 2004-11-17 Injecteur de carburant pour un moteur à combustion interne Not-in-force EP1541852B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000990A ITTO20030990A1 (it) 2003-12-10 2003-12-10 Dispositivo iniettore di combustibile per un motore a combustione interna.
ITTO20030990 2003-12-10

Publications (2)

Publication Number Publication Date
EP1541852A1 true EP1541852A1 (fr) 2005-06-15
EP1541852B1 EP1541852B1 (fr) 2006-04-19

Family

ID=34509511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04027243A Not-in-force EP1541852B1 (fr) 2003-12-10 2004-11-17 Injecteur de carburant pour un moteur à combustion interne

Country Status (8)

Country Link
US (1) US7213775B2 (fr)
EP (1) EP1541852B1 (fr)
AT (1) ATE323829T1 (fr)
AU (1) AU2004233455B2 (fr)
CA (1) CA2488148C (fr)
DE (1) DE602004000687T2 (fr)
ES (1) ES2262082T3 (fr)
IT (1) ITTO20030990A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008041241A2 (fr) * 2006-07-06 2008-04-10 Mukund Kulkarni Utilisation d'hydrogène atomique comme carburant pour les moteurs à combustion interne et autres moteurs thermiques
CN102493900A (zh) * 2011-12-05 2012-06-13 北京理工大学 一种用于气体燃料喷嘴的衔铁

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7762478B1 (en) * 2006-01-13 2010-07-27 Continental Automotive Systems Us, Inc. High speed gasoline unit fuel injector
DE102006021741A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5758865A (en) * 1996-08-21 1998-06-02 Kavlico Corporation Fuel injection valve and engine including the same
US5775599A (en) * 1996-06-12 1998-07-07 Impco Technologies, Inc. Gaseous fuel injector for internal combustion engine
US6173915B1 (en) * 1999-08-10 2001-01-16 Siemens Automotive Corporation Gaseous fuel injector with thermally stable solenoid coil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544816A (en) * 1994-08-18 1996-08-13 Siemens Automotive L.P. Housing for coil of solenoid-operated fuel injector
JPH09170501A (ja) * 1995-12-19 1997-06-30 Hitachi Ltd ガス用燃料噴射弁
JPH09273451A (ja) * 1996-04-05 1997-10-21 Keehin:Kk 気体燃料噴射弁
DE19637103A1 (de) * 1996-09-12 1998-03-19 Bosch Gmbh Robert Ventil, insbesondere Brennstoffeinspritzventil
DE19654322C2 (de) * 1996-12-24 1999-12-23 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5775599A (en) * 1996-06-12 1998-07-07 Impco Technologies, Inc. Gaseous fuel injector for internal combustion engine
US5758865A (en) * 1996-08-21 1998-06-02 Kavlico Corporation Fuel injection valve and engine including the same
US6173915B1 (en) * 1999-08-10 2001-01-16 Siemens Automotive Corporation Gaseous fuel injector with thermally stable solenoid coil

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 10 31 October 1997 (1997-10-31) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 02 30 January 1998 (1998-01-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008041241A2 (fr) * 2006-07-06 2008-04-10 Mukund Kulkarni Utilisation d'hydrogène atomique comme carburant pour les moteurs à combustion interne et autres moteurs thermiques
WO2008041241A3 (fr) * 2006-07-06 2008-08-21 Mukund Kulkarni Utilisation d'hydrogène atomique comme carburant pour les moteurs à combustion interne et autres moteurs thermiques
CN102493900A (zh) * 2011-12-05 2012-06-13 北京理工大学 一种用于气体燃料喷嘴的衔铁

Also Published As

Publication number Publication date
CA2488148C (fr) 2008-11-04
DE602004000687D1 (de) 2006-05-24
AU2004233455A1 (en) 2005-06-30
ES2262082T3 (es) 2006-11-16
AU2004233455B2 (en) 2008-11-20
US20050127210A1 (en) 2005-06-16
CA2488148A1 (fr) 2005-06-10
DE602004000687T2 (de) 2006-09-14
ATE323829T1 (de) 2006-05-15
ITTO20030990A1 (it) 2005-06-11
US7213775B2 (en) 2007-05-08
EP1541852B1 (fr) 2006-04-19

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